1,3-Butadiene, 2-(4,8,12-trimethyltridecyl)- 1-Hexadecene, 7,11,15-trimethyl-3-methylene- 2-(4,8,12-Trimethyltridecyl)buta-1,3-diene 504-96-1 HSDB 4321 NEOPHYTADIENE